package com.chalk.common.util;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;

/**
 * @author xiaoqiang
 * @Description IP地址工具类
 * @date 2018/12/17 11:00
 */
public class IPUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(IPUtil.class);

    /**
     * 获取IP地址
     * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
     * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception e) {
            LOGGER.error("IPUtils ERROR: ", ExceptionUtils.getStackTrace(e));
        }

//        /* 使用代理，则获取第一个IP地址 */
//        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
//			if(ip.indexOf(",") > 0) {
//				ip = ip.substring(0, ip.indexOf(","));
//			}
//		}

        return ip;
    }

    /**
     * 获取当前服务器IP地址
     * @return ip地址
     */
    public static String getHostAddress() {
        String hostAddress = null;
        try {
            /* 用 getLocalHost() 方法创建的InetAddress的对象 */
            InetAddress address = InetAddress.getLocalHost();
            hostAddress = address.getHostAddress();
        } catch (Exception e) {
            LOGGER.error("获取当前服务器IP异常:{}", ExceptionUtils.getStackTrace(e));
        }
        return hostAddress;
    }

}
